Robtex

Up: 143.255.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 143.255.56.0/23
Down right: 143.255.58.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.255.56.18	PTR	143-255-56-18.static.hostdime.com
143.255.56.18	A	ceictecsalud.mx
143.255.56.19	PTR	143-255-56-19.static.hostdime.com
143.255.56.19	A	dns29304.dizinc.com
143.255.56.20	PTR	143-255-56-20.static.hostdime.com
143.255.56.20	A	dns29305.dizinc.com
143.255.56.51	PTR	143-255-56-51.static.dimenoc.com
143.255.56.99	PTR	143-255-56-99.static.dimenoc.com
143.255.56.100	PTR	143-255-56-100.static.hostdime.com
143.255.56.100	A	principalresortgroup.com
143.255.56.101	PTR	143-255-56-101.static.dimenoc.com
143.255.56.107	PTR	143-255-56-107.static.dimenoc.com
143.255.56.122	A+PTR	server.bruscoo.com
143.255.56.122	A	tacode.co
143.255.56.123	PTR	143-255-56-123.static.hostdime.com
143.255.56.123	A	ns1.bruscoo.com
143.255.56.124	PTR	143-255-56-124.static.hostdime.com
143.255.56.124	A	ns2.bruscoo.com
143.255.56.154	PTR	143-255-56-154.static.hostdime.com
143.255.56.154	A	latitude21res.com
143.255.56.162	PTR	143-255-56-162.static.dimenoc.com
143.255.56.162	A	sanluis.gob.mx
143.255.56.162	A	mail.municipiodeslp.gob.mx
143.255.56.197	PTR	143-255-56-197.static.dimenoc.com
143.255.56.202	PTR	143-255-56-202.static.dimenoc.com
143.255.56.202	A	conferenciasb2b.com
143.255.56.227	PTR	143-255-56-227.static.dimenoc.com
143.255.56.250	PTR	qub.mx
143.255.56.250	A	dydtelcom.com
143.255.56.250	A	eventoscontigo.com
143.255.56.251	PTR	143-255-56-251.static.dimenoc.com
143.255.57.2	PTR	143-255-57-2.static.hostdime.com
143.255.57.2	A	globallaboratorios.com
143.255.57.2	A	a.ns.ilabosrl.com
143.255.57.19	PTR	143-255-57-19.static.hostdime.com
143.255.57.22	PTR	143-255-57-22.static.hostdime.com
143.255.57.66	PTR	143-255-57-66.static.hostdime.com
143.255.57.66	A	mx-008.staticnetcontent.com
143.255.57.66	A	mx-008.whiskergalaxy.com
143.255.57.67	A	mx.windscribe.com
143.255.57.69	PTR	143-255-57-69.static.hostdime.com
143.255.57.70	PTR	143-255-57-70.static.hostdime.com
143.255.57.99	PTR	143-255-57-99.static.hostdime.com
143.255.57.110	PTR	143-255-57-110.static.hostdime.com
143.255.57.111	PTR	143-255-57-111.static.hostdime.com
143.255.57.120	A+PTR	international-trainings.com
143.255.57.186	PTR	143-255-57-186.static.hostdime.com
143.255.57.188	PTR	143-255-57-188.static.hostdime.com
143.255.57.188	A	redt.mx
143.255.57.188	A	www.redt.mx
143.255.57.203	PTR	143-255-57-203.static.hostdime.com
143.255.57.203	A	a1-docker2-gdl.ag1.thousandeyes.com
143.255.57.218	A+PTR	server.ipmp.edu.mx
143.255.57.218	A	ipmp.edu.mx
143.255.57.219	PTR	143-255-57-219.static.hostdime.com
143.255.57.219	A	ns1.ipmp.edu.mx
143.255.57.220	PTR	143-255-57-220.static.hostdime.com
143.255.57.220	A	ns2.ipmp.edu.mx
143.255.57.227	PTR	143-255-57-227.static.dimenoc.com
143.255.57.235	PTR	a1-docker3-gdl.ag1.thousandeyes.com
143.255.58.23	PTR	143-255-58-23.static.hostdime.com
143.255.58.28	PTR	143-255-58-28.static.hostdime.com
143.255.58.28	A	theuncooperative.com
143.255.58.35	A	gdl.ipvanish.com
143.255.58.35	A	gdl-c08.vpn.ipvanish.com
143.255.58.36	PTR	143-255-58-36.static.hostdime.com
143.255.58.36	A	gdl.wlvpn.com
143.255.58.37	A	gdl.ipvanish.com
143.255.58.37	A	gdl-c09.vpn.ipvanish.com
143.255.58.38	PTR	143-255-58-38.static.hostdime.com
143.255.58.38	A	gdl.wlvpn.com
143.255.58.39	PTR	143-255-58-39.static.hostdime.com
143.255.58.41	PTR	143-255-58-41.static.hostdime.com
143.255.58.43	PTR	143-255-58-43.static.hostdime.com
143.255.58.43	A	gdl.ipvanish.com
143.255.58.51	A	gdl.ipvanish.com
143.255.58.51	A	gdl-c11.vpn.ipvanish.com
143.255.58.52	PTR	143-255-58-52.static.hostdime.com
143.255.58.52	A	gdl.wlvpn.com
143.255.58.53	A	gdl.ipvanish.com
143.255.58.53	A	gdl-c12.vpn.ipvanish.com
143.255.58.54	PTR	143-255-58-54.static.hostdime.com
143.255.58.54	A	gdl.wlvpn.com
143.255.58.55	PTR	143-255-58-55.static.hostdime.com
143.255.58.57	PTR	143-255-58-57.static.hostdime.com